# 檔案和異常：




# 讀取檔案 --讀取所有
file = 'D:/liuzhuanfang/python/Hogwartsliu/xueqiu/file_read.txt'
# 第2個實參定義 "w" --寫入(刪除原檔案)，"r" --讀取，"a" --寫入(原檔案後新增)，"r+" --讀寫
with open(file,"r+") as f:  
    content1 = f.write("I love play5.\n")  # "\n" --換行
    content2 = f.read()
    print(content2)



# 讀取檔案 --按行讀取
file = '
 
D:/liuzhuanfang/python/Hogwartsliu/xueqiu/file_read.txt'
with open(file) as f:
    for line in f:
        print(line.strip()) # 刪除首尾空格
        time.sleep(2)


# 讀取檔案
file = 'D:/liuzhuanfang/python/Hogwartsliu/xueqiu/file_read.txt'
with open(file) as f:
    lines = f.readlines()   # 檔案讀取後以 列表顯示
pi = ""
for line in
 
 lines:
    pi+=line.strip()  # 組合成一個新的字串
print(lines[:10] + "...")  # 切片查詢
print(len(pi))




# 異常處理：
# try-except：出現異常 程式還能繼續執行
try:
    print(5/0)
except ZeroDivisionError:
    print("you can't divide by zero !")
    
    
    
# ZeroDivisionError --處理分子不能為0：
while True:
    first = input("\n number1:
 
")
    if first=="q":
        break        # 遇到break 直接退出迴圈
    second = input("number2:")
    if second =="q":
        break
    try:
        answer = int(first)/int(second)  # 執行條件
    except ZeroDivisionError:            # 條件異常丟擲錯誤 並繼續往後執行
        print("you can't divide by 0!")
    else:
        print(answer)




# FileNotFoundError --處理檔案找不到
filenaem = "ali.txt"
try:
    with open(filenaem) as f :
        contents = f.read()
except FileNotFoundError:
    print("file is not fond")
    
    
案例：
def count(file):
    try:
        with open(file) as f :
            contents = f.read()
    except FileNotFoundError:
        pass  # 相當於 佔位符
      # print(file +"file is not fond")
    else:
        words = contents.split(sep=",")  # 以逗號分隔
        num = len(words)
        print("the file"+ file + "has about " + str(num)+ " words.")

file = 'D:/liuzhuanfang/python/Hogwartsliu/xueqiu/file_read1.txt'
count(file)